1. Department of Cardiology, Inselspital, University of Bern, Freiburgstrasse, CH-3010 Bern, Switzerland
2. Clinical Trials Unit, University of Bern, Freiburgstrasse, CH-3010 Bern, Switzerland
3. Division of Cardiology, Structural Heart and Valve Center, Columbia University Medical Center, 177 Fort Washington Avenue, New York, NY 10032, USA